Thread Necromancy Scorer

import java.io.IOException;
import java.io.PrintStream;
import java.net.URL;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.time.Instant;
import java.time.ZoneId;
import java.time.ZonedDateTime;
import java.time.format.TextStyle;
import java.time.temporal.ChronoUnit;
import java.util.*;
import java.util.regex.*;

public class ThreadNecromancyScorer {
	static long parse(String datetime){
		long d=0;
		String date=datetime.replaceAll("(.+?) (.+)","$1");
		String time=datetime.replaceAll("(.+?) (.+)","$2");
		ZonedDateTime t=Instant.now().atZone(ZoneId.of("GMT-8"));
		if(date.equals("Today")){
			date=t.getYear()+"-"+t.getMonth().getDisplayName(TextStyle.SHORT,Locale.ENGLISH)+"-"+String.format("%1$02d",t.getDayOfMonth());
		}else if(datetime.startsWith("Yesterday")){
			t=t.minus(1,ChronoUnit.DAYS);
			date=t.getYear()+"-"+t.getMonth().getDisplayName(TextStyle.SHORT,Locale.ENGLISH)+"-"+String.format("%1$02d",t.getDayOfMonth());
		};
			try {
				d=new SimpleDateFormat("yyyy-MMM-dd HH:mm:ss Z").parse(date+" "+time+" -0800").getTime();
			} catch (ParseException e) {
				RuntimeException r=new RuntimeException();
				r.initCause(e);
				throw r;
			}
		return d;
	}
	public static void main(String[]args) throws IOException{
		URL url=new URL("http://tbgforums.com/forums/viewtopic.php?id=2111&p=1");
		Scanner s=new Scanner(url.openStream());
		String htmlSource=s.useDelimiter("\\Z").next().replaceAll("\n","").replaceAll(".+<body>(.+)</body>.+","$1");
		System.setOut(new PrintStream("out.txt"));
		s.close();
		Matcher m=Pattern.compile("<a href=\"viewtopic.php.id=2111.+?p=.+?\">(\\d+)</a>").matcher(htmlSource);
		int lastPage=0;
		while(m.find())lastPage=Integer.parseInt(m.group(1));
		List<String>posters=new LinkedList<>();
		List<String>timestamps=new LinkedList<>();
		for(int i=1;i<=lastPage;i++){
			System.err.printf("Fetching page %s/%s\n",i,lastPage);
			url=new URL("http://tbgforums.com/forums/viewtopic.php?id=2111&p="+i);
			s=new Scanner(url.openStream());
			htmlSource=s.useDelimiter("\\Z").next().replaceAll("\n","").replaceAll("\\s+"," ").replaceAll(".+<body>(.+)</body>.+","$1");
			m=Pattern.compile("<dt><strong>(.+?)</strong></dt>").matcher(htmlSource);
			while(m.find()){
				posters.add(m.group(1).replaceAll("&#039;","'"));
			}
			m=Pattern.compile("<a href=\"viewtopic.php.pid=.+?#p.+?\">(.+?\\d{2})</a></span>").matcher(htmlSource);
			while(m.find()){
				timestamps.add(m.group(1).replace("&#8201;",""));
			}
		}
		List<Long>timestampsInt=new LinkedList<>();
		for(String tim:timestamps){
			long t=parse(tim);
			timestampsInt.add(t);
		}
		timestamps=null;
		System.gc();
		Iterator<String>post=posters.iterator();
		Iterator<Long>times=timestampsInt.iterator();
		String poster=post.next();
		long tsA=times.next();
		Map<String,Long>scores=new HashMap<>();
		while(post.hasNext()){
			long tsB=tsA;
			String p2=poster;
			poster=post.next();
			//begin aliases
			if(poster.equals("TBGbobe"))poster="seanbobe";
			if(poster.equals("seanbobe3"))poster="seanbobe";
			//end aliases
			if(poster.equals(p2)){//double post detection
				times.next();
				continue;
			}
			tsA=times.next();
			scores.put(poster,scores.getOrDefault(poster,0L)+Math.min((59000+tsA-tsB)/60000,10080));
		}
		List<Map.Entry<String,Long>>scoreList=new ArrayList<>(scores.entrySet());
		scoreList.sort((a,b)->{
			return (int)(b.getValue()-a.getValue());
		});
		for(Map.Entry<String,Long> e:scoreList){
			System.out.println(e.getKey()+" - "+(e.getValue()/60)+":"+String.format("%1$02d",e.getValue()%60));
		}
	}
}